Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0204c&link_type=abstract
American Astronomical Society, DPS meeting #41, #2.04
Astronomy and Astrophysics
Astronomy
Scientific paper
Cassini flew by the Moon on August 19, 1999, and the Visual and Infrared Mapping Spectrometer (VIMS) obtained 13 image cubes with a spatial resolution of about 175 km per pixel with spectral coverage over the 3-?m region. The thermal emission from the lunar surface is a low-frequency shape added to the spectra that complicates but does not prevent the search for narrower water and hydroxyl absorptions. Thermal emission is lower in the lunar polar regions due to the lower temperatures, reducing the complications. The thermal emission was removed from the VIMS spectra and the data were searched for the spectral signatures of volatile compounds. Abundances of any detected water are difficult to determine because the amounts of water indicated in the spectra are dependent on the albedo and the grain sizes in the rocks and soils and on the type of mixing. A 3% absorption, for example, ranges from 10 to 1,000 parts per million in a spatially uniform distribution or locally higher. Results will be presented.
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